Recent/;/ published Ornithological Works. 161 



Ptilosclera versicolor (col. pi.). A general and a systematic 

 index are added, and also an appendix, in which, among other 

 items, details are given of the rearing in captivity of the 

 young of Ijjatycercus erythropeplus, which is proved to be a 

 hybrid between P. elegans and P. eximius. P. master 'sianus 

 is, moreover, considered to be a variety of P. elegans. 



2 1. Sharpens 'Hand-list of Birds,' vol. iv. 



[A Hand-list of the Genera and Species of Birds. (Nomenclator Avium 

 turn Fossilium turn Viventium.) By R. Bowdler Sharpe, L.L.D., Assistant 

 Keeper, Department of Zoology, British Museum. Vol. IV. London, 

 1903. Pp. xii+392. Price 10s.] 



The third volume of the ' Hand-list ' was issued in 1901, as 

 already recorded in this Journal (see ' Ibis/ 1902, p. 159). in 

 the fourth volume, published in September last, Dr. Bowdler 

 Sharpe continues the enumeration of the Acromyodian 

 Passeres, and treats of the following families : — 



No. of genera. No. of species. 



Fam. V. Timeliidae 122 575 



VI. Troglodytidse 22 256 



VII. Cinclidse 1 19 



VIII. Mimidce 14 71 



IX. Turdidse 75 598 



X. Sylviidse 76 523 



XI. Vireonidee 6 111 



XII. Ampelidse 5 10 



XIII. Artamidte 2 20 



XIV. Vangidte (5 12 



XV. Prionopidos 16 '.>•"> 



XVI. Aerocharidpe 1 1 



XVII. Laniidte 33 321 



XVIII. Paridse 24 209 



XIX. Chamseidae 1 3 



XX. Regulidifi -1 20 



XXI. Sittidss •"> 60 



XXII. Certhiidse "> 39 



41 s 2943 



It will thus be seen that the average number of species to 

 a genus is about 7. This seems to be rather a low average. 

 We believe that the number of genera admitted in Zoology 

 might be considerably reduced, and with great advantage. 



SER. VIII. VOL. IV. M 



